Red Hat Postfix FAQ
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4.7 When I set up $mynetworks in /etc/postfix/main.cf I used CIDR shorthand (e.g. 127/8). I now appear to be having a problem. I guess Postfix doesn't like shorthand CIDR entries?

Correct. Use 127.0.0.0/8 instead. See section 8.2 in the Red Hat Postfix HOWTO for additional information.

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4.6 I'm getting an error when I send mail to my own server. It says "mail for mydomain.com loops back to itself". What do I do to fix this?Up4.8 I've got some bounced mail in the queue which is not being accepted by the remote site. How can I remove it from the queue?